All .30 caliber components are readily available. Hornady makes cases and have been in constant supply for years. With the internet, finding cases is not a problem.
Loaded factory ammo is limited in comparison to other main stream calibers but not a problem to a rifle loony and hand loader.

It has a better length neck for loading the heavier bullets without losing powder capacity as in the .300 WM.
You can load it pretty stout or mild to suit your fancy. It will NATURALLY feed and extract slicker than most. No custom gunsmithing required to make it digest cartridges like others.
It is capable of extreme accuracy. In the right hands, it has unlimited potential in the field. It has been around for a few years and not withered away like some. With today's bullets/components it is deadlier than ever and keeps pace with the newer.

To me, it is a 63 split window Corvette with a 427 CI. No need to justify it if you can afford it. Sexy can be expensive.